3results about How to "Control contact area" patented technology

The invention relates to a Bayer process red mud dealkalization method, which comprises: adding a dealkalization seed crystal and an auxiliary agent into Bayer process red mud raw stock to dealkalize the Bayer process red mud raw stock to obtain dealkalized red mud slurry; wherein the auxiliary agent comprises a catalytic auxiliary agent with a viscosity reduction effect and a dealkalization auxiliary agent, and the dealkalization auxiliary agent comprises at least one of the following raw material components: calcium hydroxide and calcium oxide. According to the Bayer process red mud dealkalization method provided by the invention, under the synergistic effect of the catalytic promoter with a viscosity reduction effect, the dealkalization promoter containing calcium hydroxide and / or calcium oxide and the dealkalization seed crystal, and by matching with mild dealkalization temperature and relatively short dealkalization time, the purpose of improving the dealkalization efficiency of the Bayer process red mud primary pulp is achieved; and the dealkalization rate reaches 75% or above.

The invention discloses a micro-drip-irrigation three-dimensional soil fixation mesh pad and a preparation method thereof, and relates to the technical field of ecological environment protection, the micro-drip-irrigation three-dimensional soil fixation mesh pad comprises an irrigation device and a three-dimensional soil fixation mesh pad, and further comprises a micro-drip-irrigation assembly connected with the three-dimensional soil fixation mesh pad, the micro-drip irrigation assembly comprises a plurality of reinforcing ribs used for transmitting fluid and a plurality of micro-drip irrigation switches arranged on the reinforcing ribs, and the micro-drip irrigation switches are used for controlling the speed of sucking the fluid from the reinforcing ribs; the problem that irrigation is uneven due to the fact that an irrigation line of an existing three-dimensional geonet pad irrigation device is long is solved.

This invention discloses a tension control device for conveying plastic film in packaging bag processing, relating to the field of plastic film conveying technology. The second tension control structure of this invention includes a power conveying control unit, which is present in addition to the first tension control structure. The first tension control structure includes a first base frame, a first lower conveying roller unit, and a first upper pressure roller unit. The first lower conveying roller unit includes an angle adjustment mounting box, an angle adjustment lower roller frame, an angle adjustment upper roller frame, a lower roller assembly, and an upper roller assembly. The second tension control structure includes a second base frame, a second lower conveying roller unit, and a second upper pressure roller unit. This invention uses the first tension control structure to adjust the traction force when the plastic film is pulled, while the second tension control structure can provide both conveying speed and pulling force, thereby achieving tension control and solving the problems of low tension control accuracy and inability to adjust tension in a timely manner when the conveying speed changes in existing methods.